I would be curious to know what the school'd nit policy is.
I worked for a time in a local health department in a county with 2 schools. One school had a no-nit policy and the other did not. Meaning if no live bugs were seen, the child could return to school.
BTW, it is impossible to tell if the nit is alive or not.
At the health department we had repeat offenders - the same kids coming back month after month. Education would definately be helpful for some of these people. One parent was vision impared and she could not tell if the problem had been eradicated or not. We suggested she take the child out in her yard and check, the sunlight makes them easier to see.
The stigma attaches to these children is terrible, other children can be so cruel sometimes. Eventhough it is not their fault and anyone could catch them.